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    <a href='mailto:email@localhost'>localhost domain</a>
    <a href='mailto:email@example.com?subject=Subject+with+plus+signs'>plus sign in subject</a>
    <a href='mailto:email@example.com?subject=Subject%20with%20spaces'>spaces in subject</a>
    <a href='mailto:email@example.com?subject=Test+Subject&cc=email2@example.com'>cc param</a>
    <a href='mailto:my-c0m.pl3x_email@ex-ample.co.uk?subject=Test+Subject&body=Test%20Body&cc=email@example.com'>crazy case</a>
    <a href='mailto:email'>@example.com hacker</a>
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